Drill bit wrench



, M ay 19, 1942.

DRILL BIT WRENCH Filed April 5, 1940 &

lNvENToR figaf/Zfaaf/v Patented May 19, 1942 einen UNTED STATES' BTENT OFFICE y DRILL BIT WRENCH George H. (loplen, Cripple lCreek, Colo. Application April 5, 1940, Serial No. 327,977

` claims. (c1. a1- 55) Certain types of rock drills have removable bit heads which are threaded into thedrill shank by means of a left handed thread. Itis exceedingly diicult to remove these headsdue to the fact that their particular shape is not adaptable to any of the standard wrenches and due to the fact that it is diicult to hold the drill shank while the head is being removed.

The principal object of this invention is to provide a unitary Wrench which will simultaneously rotate the bit head and the drill shank in opi posite directions to quickly and easily loosen and In the following detailed description of the invention reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. 1 is a perspective view illustrating the improved tool in use on the extremity of a drillshank.

Fig. 2 is an inside fac-e View ofv the tool.

ber I'I is formed with relatively sharp ratchet. I

teeth It. Diametrically opposite from the lug I6 is an ear 20 which is drilled and tapped to receive a handle pivot bolt 2| upon which a second handle member'ZZ is hinged. j

The second handle member is spaced from the annular plate I4 `by means of suitable ,spacing washers 23. The handle` member Y22 extends in-y wardly beyond the pivotr bolt 2|; and terminates in an inclined extremity provided with sharpened ratchet teeth 24.

The outer face of the socket I0 is closed by means of a stop plate 2t which is slotted as shown at 2l in the shape of a cross to receive the crossed, sharpened edges of the drill bit head. The stop plate is held in place by means of suitable attachment screws 28. t

In use, the open face of the tool is slipped over the drill bit head so that the grooves in the latter will receive the bosses 25 of the socket Ill and so that the edges of the bit head will project through the crossed slot 2l, as shown in Fig. 3.

The gripping member I'I is swung against the shank and the handles II and I2 are taken' in each hand and turned in opposite directions.

Fig. 3 is a vertical section therethrough, taken' on the line 3 3, Fig. 2.

Fig. 4 is a detail sectional view, illustrating the type of removable bit head for which the invention is designed.

In the drawing a typical drill shank is indicated at 29 and the detachable head thereof at 3D. The invention employs a hollow, cylindrical socket I0 from which a handle Il projects. The

interior of the socket Ill is conformed by means of projecting bosses 25 to fit into the grooves of the usual drill bit head.

An outer sleeve member I2 surrounds the socket It and rests in a shouldered recess I3 therein. The sleeve member I2 may be held in place on the socket in any desired manner. As Aillustrated, it is held in place by means of an annular plate I4 secured thereto by means of suitable screws I5.

This causes the teeth I9 and 2d to bite into the shank and rotate it in one direction while the socket member, through the medium of the lugs 25 and the slotted plate 26, grips the head and rotates it in the opposite direction, so as to readily unscrew the head from the shank.

. While aspecic form of the improvement has l. A Wrench for removing a drill bit head from" a drill shank comprising: a socket member conformed on its interior to receive a drill bit head; i

a rotatable sleeve about said socket member; a

handle fixed to and projecting from rsaid socket member; 'a second handle pivoted on said sleeve;

' an inwardly projecting extremity on said Ysecond A hinge lug I6 'projects from the face of the sleeve I2 and hingedly supports a gripping member I1 upon a suitable hinge pin I8. The memhandle; teeth on said latter extremity for engaging a drill bit shank; and means for preventing said head from passing entirely through said socket member. v

2. A wrench for removing a drill bit head from a drill shank comprising: a socket'member conformed -on its interior to receive a drill bit head;

a rotatable sleeve about said socket member;V a

handle fixed to and projecting from said socket member; a second handle pivoted on said sleeve; an inwardly projecting extremity on said second handle; teeth on said latter extremity for engag- 3. A wrench for removing a drill bit head from f a drill shank comprising: a socket member conformed on its interior to receive a drill bit head; a rotatable sleeve about said socket member; a

handle xed to and projecting from said socket member; a second handle pivoted ron said sleeve; an inwardly projecting extremity on said second handle; teeth on said latter extremity for engaging a drill bit shank; and a transversely hinged, toothed, gripping member on said sleeve opposite from said second handle member to swing in a plane parallel to the axis of saidsocket member for gripping the opposite side of thedrill bit shank.

4. A wrench for removing a drill bit head from a drill shank comprising: a hollow cylindrical socket member; projections on the interior of said socket member for engaging the grooved head of a drill bit; a handle xedly projecting from said socket member; a headplate closing the rst face of said socket member to hold a bit head in place therein; a cylindrical sleeve rotatably surrounding the socket member adjacent the second face thereof; a retaining ring about said second face for holding said rotatable sleeve in place thereon; a pivot member projecting forwardly from said second face; a second handle member freely pivoted on said pivot member so as to swing in parallel relation with and in front of said second face; and teeth Von one extremity of said second handle member for engaging the shank of a bit when the latters headis in said socket member.

5. A wrench for removing a drill bit head from a drill shankl comprising: a hollow cylindrical socket member; projections on the interior of said socket member for engaging the grooved head of a drill bit; a handle iixedly projecting from said socket member; a head plate closing the first face of said socket member to hold a bit head in place therein; a cylindrical sleeve rotatably surrounding the socket member adjacent the second face thereof; a retaining ring about said second face for holding said rotatable sleeve in place thereon; a pivot member projecting forwardly from said second face; a second handle member freely pivoted on said pivot mem` ber so as to swing in parallel relation with and in front of said second face; teeth on one extremity of said second handle member for engaging the shank of a bit when the latters head is Yin said socket member; a hinge lug projecting forwardly from said cylindrical sleeve opposite said pivot member; and a toothed gripping member hinged on said hinge lug so that it may swing in a plane parallel to the axis of said socket member against the bit shank.

GEORGE COPLEN. 

